The instability is only when overclocked past the core limit, not just IMC, but the core. P95 doesn't test stability of all core regions but one, FPU.
Temps, as far as I know they are correct from cores on all boards but DFI/Sapphire where they're either too low or two high from one BIOS to another. It's the BIOS that's cusing it now anything else. Your EVEREST CPU "diode" reading should be about 10C less than the core reading, since diode is outisde of the core on the anode/cathode pins. That's consistent on all CPUs which have an internal and external diode. Stock 9850BE, TT120 gave me 48C load at 20C ambient on the MSI and the Abit board. TRUE bettered it by 2C and Xig bettered it by a further 2C.